An intertidal species of seastar helps to maintain the diversity of the intertidal region by controlling the mussel population. Without the seastar, the mussel population would crowd out other species and take over their territory
The seastar could be called a(n)
a. indicator species
b. keystone species
c. foundation species
d. aggressive species
e. repressor species
B
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Under the precautionary principle approach, chemicals are assumed safe until scientific research could support otherwise.
Answer the following statement true (T) or false (F)
At the end of 2 seconds, a skydiver freely falling from rest has a speed of
A. 1 m/s. B. 10 m/s. C. 5 m/s. D. more than 10 m/s.
What occurs during compaction?
A) A machine takes the sediment and stomps it down as much as possible. B) Sediment is heated up which causes it to condense. C) Additional layers of sediment accumulate and press down on the layers underneath them. D) Sediment crystallizes which causes it to condense.
The loss of biodiversity most severely affects
A) developed nations of the world. B) the wealthiest people in the world. C) the poorest people in developing nations. D) the production of food in the developed world.